Pt with missing lower right 1st molar for long time you'll find.. Mesial drifting of lower right 2nd molar

Pt with missing lower right 1st molar for long time you'll find:
a. Mesial drifting of lower right 2nd molar.***
b. Intrusion of upper right 1st molar.
c. Over eruption of lower right 2nd molar.